EP0859525B1 - Stereoskopische Bilddarstellugnsvorrichtung mit spezifischem Maskenmuster - Google Patents

Stereoskopische Bilddarstellugnsvorrichtung mit spezifischem Maskenmuster Download PDF

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Publication number
EP0859525B1
EP0859525B1 EP98301160A EP98301160A EP0859525B1 EP 0859525 B1 EP0859525 B1 EP 0859525B1 EP 98301160 A EP98301160 A EP 98301160A EP 98301160 A EP98301160 A EP 98301160A EP 0859525 B1 EP0859525 B1 EP 0859525B1
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EP
European Patent Office
Prior art keywords
light
plural
horizontal
illuminating areas
illuminating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98301160A
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English (en)
French (fr)
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EP0859525A2 (de
EP0859525A3 (de
Inventor
Kazutaka Inoguchi
Hiroyasu Nose
Hideki Morishima
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Canon Inc
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Canon Inc
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Publication of EP0859525A3 publication Critical patent/EP0859525A3/de
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
    • G02B30/29—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays characterised by the geometry of the lenticular array, e.g. slanted arrays, irregular arrays or arrays of varying shape or size
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
    • H04N13/305—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using lenticular lenses, e.g. arrangements of cylindrical lenses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
    • H04N13/31—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
    • H04N13/32—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using arrays of controllable light sources; using moving apertures or moving light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/327—Calibration thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/189—Recording image signals; Reproducing recorded image signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/286—Image signal generators having separate monoscopic and stereoscopic modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/324—Colour aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/337—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using polarisation multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/398—Synchronisation thereof; Control thereof

Definitions

  • the present invention relates to a stereoscopic image display apparatus, particularly apparatus used for stereoscopically displaying an image on a display device (display) for viewing from a predetermined observation area.
  • the lenticular lens is provided on the viewer's side of the display device so as to give directivity to each pixel of the parallax images displayed on the display device, thereby enabling the viewer to recognize a stereoscopic image.
  • This method of using the lenticular lens has an advantage of enabling stereoscopic viewing without using polarizing glasses.
  • this method has a problem of glare because the lenticular lens is provided on the front surface of the display.
  • JP-A-9311294 a stereoscopic image display apparatus, as disclosed in Japanese Patent Application No. 8-148611, (JP-A-9311294) enabling the viewing of a satisfactory stereoscopic image from a wide area.
  • the above application No. 8-148611 discloses a stereoscopic image display apparatus comprising: light source means for emitting light from plural apertures, having a light source and a mask substrate provided with a mask pattern having plural apertures; a micro-optical device having different optical effect in the horizontal and vertical directions; and a transmission-type display device.
  • right stripe pixels and left stripe pixels obtained by dividing each of a right-eye parallax image and a left-eye parallax image into multiple stripe patterns of pixels, are alternately arrayed in a predetermined order whereby forming one image as a stripe-combined image to be displayed on the display device; light emitted by the light source means is provided with a directivity by the micro-optical device so as to irradiate the stripe-combined image; and the light is separated into at least two solid angles, enabling the viewer to recognize the stripe-combined image as a stereoscopic image.
  • the mask pattern is configured with apertures and light shielding portions arranged in a checker pattern.
  • two lenticular lenses each consisting of plural cylindrical lenses having refractive power in one direction are arranged such that the cylindrical lenses are arranged orthogonally.
  • an area,from which an image on a display can be stereoscopically viewed, is enlarged, making it possible to view an excellent stereoscopic image from a wide area.
  • the present invention has been made in consideration of the above problems, and has as its object to further improve the conventional stereoscopic image display apparatus, and provide a stereoscopic image display apparatus which enables the viewing of a high quality stereoscopic image from a wide area without seeing a double image, while giving flexibility to precise adjustment during the assembly of the main portion of the components which construct the entire apparatus.
  • a stereoscopic image display device of a type similar to the conventional stereoscopic image display apparatus, as specifically recited in the preamble of claim 1 attached hereto, which is characterised in that, the vertical widths of the illuminating areas and the non-illuminating areas, Vt and Vs respectively, satisfy the following inequality: Vt ⁇ Vs.
  • the stereoscopic image display apparatus gives flexibility to required precise alignment in vertical positioning as compared to the conventional stereoscopic display apparatus, and it is possible thus to achieve cost reduction in adjustment during assembly.
  • the present invention enables the viewing of a high quality stereoscopic image from a wide area without seeing a double image, while giving flexibility to precise adjustment during the assembly of the main portion of components which construct the entire apparatus.
  • European Patent Application EP-A-0827350 discloses, according to figure 13 thereof, a stereoscopic image display apparatus comprising a display device for displaying parallax images, a lenticular lens as optical means and light providing means for providing patterned luminous flux comprising plural illuminating areas for illuminating said display device via said optical means and plural non-illuminating areas for not illuminating said display device, said plural illuminating areas and said plural non-illuminating areas being arranged in both the horizontal and vertical directions.
  • the vertical widths of the illuminating areas and non-illuminating areas say Vt and Vs respectively, satisfy the aforesaid inequality Vt ⁇ Vs.
  • this apparatus does not comprise optical means having an array of optical elements each having a lens function in the vertical direction.
  • the lenticular lens employed is a vertical lenticular lens, i.e. an optical means having an array of optical elements each having a lens function in the horizontal direction only.
  • the horizontal widths of said illuminating areas and said non-illuminating areas, Ht and Hs respectively satisfy the following inequality: Ht ⁇ Hs.
  • a stereoscopic image display apparatus of a type similar to the conventional stereoscopic image display apparatus, as specifically recited in the preamble of claim 8 attached hereto, which is characterised in that the horizontal widths of the illuminating areas and the non-illuminating areas, Ht and Hs respectively, satisfy the following inequality: Ht ⁇ Hs.
  • the stereoscopic image display apparatus gives flexibility to required precise alignment in horizontal positioning as compared to the conventional stereoscopic display apparatus, and it is possible thus to achieve cost reduction in adjustment during assembly.
  • the present invention enables the viewing of a high quality stereoscopic image from a wide area without seeing a double image, while giving flexibility to precise adjustment during the assembly of the main portion of components which construct the entire apparatus.
  • European Patent Application EP-A-0788008 discloses a stereoscopic image display apparatus comprising light providing means, optical means as recited in claim 8 attached, and a display device also as recited in claim 8 attached.
  • the light providing means disclosed therein comprises a rear light source in combination with a transmissive liquid crystal device having regions switchable between a light transmitting state and an opaque state to provide plural illuminating areas and plural non-illuminating areas.
  • a drive circuit switches the regions to display first and second mask patterns of checkered patterned light transmitting regions and opaque regions for transmitting light to illuminate the display device to provide a stereoscopic image.
  • the drive circuit can also switch the regions of the liquid crystal device to provide an entirely open (light transmitting) state in an area corresponding to an area of the display device having a two-dimensional image.
  • the switchable regions appear to have the same horizontal width and are separated in the horizontal direction by strips.
  • EP-A-0788008 also discloses providing an entirely open (light-transmitting) area in the liquid crystal device and so discloses that the strips are light transmitting.
  • EP-A-0788008 therefore discloses light providing means in which the horizontal width of the plural illuminating areas is greater than the horizontal width of the plural non-illuminating areas.
  • the optical means comprises a first lenticular lens where a plurality of cylindrical lenses having refractive power in the horizontal direction are arrayed horizontally at a predetermined pitch, and a second lenticular lens where a plurality of cylindrical lenses having refractive power in the vertical direction are arrayed vertically at a predetermined pitch.
  • the image displayed by the display device consists of a horizontal-stripe combined image, in which two parallax images are respectively divided into multiple horizontal-stripe parallax images, and the divided horizontal-stripe parallax images are repeatedly arrayed at a predetermined pitch in the vertical direction in a predetermined order in correspondence with the number, N, of parallax images.
  • the optical means is adapted to convert each part of the patterned luminous flux into substantially parallel luminous flux in the horizontal cross-section, and into luminous flux converging substantially on the display device in the vertical cross-section.
  • Fig. 1 is a perspective view showing the main portion of the first embodiment of the present invention.
  • Fig. 2 is an explanatory view of a mask pattern shown in Fig. 1.
  • Fig. 3 is an explanatory view of a H-Z plane of the H-V-Z coordinates system shown in Fig. 1; and
  • Fig. 4 is an explanatory view of a V-Z plane of the H-V-Z coordinates system in Fig. 1.
  • reference numeral 1 denotes a transmission-type liquid crystal display (LCD) for displaying an image, for example, having a liquid crystal layer, glass substrates, polarizing plate, color filters, black matrix, electrodes and the like.
  • Reference numeral 5 denotes a back light serving as a light source. Located in front of the back light 5 is a mask substrate 4 on which a mask pattern 7, having light-transmitting apertures (openings) 6 arranged in a checker pattern in a predetermined pitch, is formed.
  • the mask pattern 7 is made of a metal deposition film such as chrome or the like, or light absorptive materials, and is formed on the mask substrate 4 made of a glass or resin by patterning.
  • an aperture width Vt of each of apertures 6a and 6b in the vertical direction (direction V) of the mask pattern and a light shielding width Vs of each of light shielding portions 6c in the vertical direction of the mask pattern satisfy the inequality: Vt ⁇ Vs.
  • reference numeral 3 denotes a first lenticular lens (vertical lenticular lens) where a plurality of cylindrical lenses, having horizontal (direction H) refractive power, are arranged in the horizontal direction; and 2, a second lenticular lens (horizontal lenticular lens) where a plurality of cylindrical lenses, having vertical (direction V) refractive power, are arranged in the vertical direction.
  • the first and second lenticular lenses 3 and 2 are positioned in an arbitrary order in between the mask substrate 4 and the liquid crystal display 1 which displays an image.
  • Reference numeral 11 denotes a display driver for displaying a horizontal-stripe combined image on the LCD 1.
  • Reference numeral 12 denotes an image processor, wherein multiple horizontal-stripe parallax images (parallax image) are taken out of plural parallax images of a stereoscopic object viewed from plural viewpoints, and combined by repeatedly arraying them in a predetermined order in a predetermined pitch in the vertical direction, whereby generating a horizontal-stripe combined image.
  • the generated horizontal-stripe combined image is inputted to the display driver 11.
  • Light from the back light 5 transmits through each of the apertures 6 of the mask pattern 7, illuminates the LCD 1 through the first and second lenticular lenses 3 and 2, and separates plural parallax images displayed on the LCD 1 at a predetermined observation position. By this, a stereoscopic image displayed on the LCD 1 can be viewed.
  • Fig. 3 is a cross-sectional top view of the stereoscopic image display apparatus shown in Fig. 1, and explains the principle of how each of the parallax images corresponding to two viewpoints is separated in the horizontal direction and viewed from the observation position in front of the LCD 1 shown in Fig. 1.
  • Fig. 3 shows a cross-section of a line pattern having apertures 6a of the mask pattern 7 in which illuminated light based on the left parallax image L as the first viewpoint is focused on a left eye EL (corresponding to a cross section cut along the line a- a' in Fig. 2).
  • luminous flux from the back light 5 illuminates the mask substrate 4, and the light emits through the apertures 6a of the mask pattern 7.
  • the first lenticular lens 3 is positioned between the mask substrate 4 and the LCD 1 (since the second lenticular lens 2 does not have a horizontal refractive power, it is shown as a flat board in Fig. 3).
  • a lens curvature of the plurality of cylindrical lenses 3a is designed such that the mask pattern 7 is positioned at a substantial focus point of each of the cylindrical lenses 3a. It is designed such that a pair of aperture 6a and light shielding portion 6c of the mask pattern 7 is slightly larger than one pitch of the cylindrical lens 3a of the first lenticular lens 3.
  • Illuminated luminous flux from one point of a row (horizontal direction) of aperture arrays (line pattern), consisting of the apertures 6a and light shielding portions 6c on the mask substrate 4 shown in Fig. 3, is changed to a substantial-parallel luminous flux having a certain directivity by the first lenticular lens 3; the substantial-parallel luminous flux illuminates the first parallax image L (left parallax image) of the two horizontal-stripe parallax images arrayed cyclically in the vertical direction which are displayed on the LCD 1; and the substantial-parallel luminous flux focuses on around the first viewpoint (left eye) EL.
  • a row of aperture arrays consisting of the apertures 6b and light shielding portions 6c on the mask substrate 4 is an aperture array positioned one row below (direction V) the aforementioned row of aperture arrays in Fig. 2, and is configured with a pattern where a column of the apertures 6a and a column of light shielding portions 6c are horizontally shifted by 1/2 pitch, a pitch being the distance between an aperture (e.g. 6a) and a light shielding portion (e.g. 6c).
  • the luminous flux illuminated through the apertures 6b is changed similarly to substantial-parallel luminous flux having a certain directivity, which is different from the aforementioned directivity shown in Fig.
  • the substantial-parallel luminous flux illuminates the second parallax image R (right parallax image) of the two horizontal-stripe parallax images arrayed cyclically in the vertical direction which are displayed on the LCD 1; and the substantial-parallel luminous flux focuses on around the second viewpoint (right eye) ER.
  • the luminous flux emitted through the apertures 6 on the mask substrate 4 is changed to substantial-parallel luminous flux by transmitting through the first lenticular lens 3, illuminates each of the first and second parallax images R and L on the LCD 1 with respective directivities, and focuses on viewpoints EL and ER. Accordingly, image data displayed on the LCD 1 is stereoscopically viewed.
  • Fig. 4 is a schematic view (cross-section cut along the line b-b' in Fig. 2) of a V-Z cross-section (direction V) of the stereoscopic image display apparatus according to the present invention.
  • V cross-section cut along the line b-b' in Fig. 2
  • the first lenticular lens 3 which does not have a refractive power on the cross-section, and glass substrates which do not directly relate to the optical effect are omitted in Fig. 4.
  • the second lenticular lens 2 is shown conceptually.
  • the apertures 6a of the mask pattern 7 on the mask substrate 4 are arranged as shown in Fig. 2. In terms of the vertical direction, each row is shifted alternately by 1/2 pitch in the horizontal direction in correspondence with the two horizontal-stripe parallax images L and R arrayed cyclically in the vertical direction which are displayed on the LCD 1.
  • the line pattern on the mask pattern 7 shown in Fig. 4 is used for illuminating parallax image lines of any one of the two parallax images L and R.
  • Fig. 4 shows, as an example, a line pattern of the left parallax image L (first parallax image) corresponding to the first viewpoint.
  • the black portions on the mask pattern 7 besides the apertures 6a are light shielding portions 6c where light does not transmit through.
  • a line on the LCD 1 displaying the stripe-patterned left parallax image L corresponding to the first viewpoint is shown in white, and a line displaying the stripe-patterned right parallax image R corresponding to the second viewpoint is shown in black.
  • a vertical pitch between an aperture 6a and an adjacent aperture 6a on the mask pattern 7 is Vm; a pitch of cylindrical lenses 2a of the second lenticular lens 2 is VL; a focal distance, in the direction of the sheet of Fig. 4 (V-Z plane), of each of the cylindrical lenses constructing the second lenticular lens 2 is fv (not shown); a pixel pitch in the vertical direction (direction V) of the LCD 1 which displays an image is Vd; the distance from the display surface of the LCD 1 to the second lenticular lens 2 is L1; and the distance from the second lenticular lens 2 to the mask pattern 7 is L2.
  • Each value is set so as to satisfy the followings: 0.95 ⁇ Vd/(Vm/2) ⁇ /(L1/L2) ⁇ 1.05 0.96 ⁇ (Vd/VL)/ ⁇ (L1+L2)/(2 ⁇ L2) ⁇ 1.04 0.9 ⁇ (1/fv)/(1/L1+1/L2) ⁇ 1.1
  • luminous flux from one point of an aperture 6a of the mask pattern 7 is focused on the corresponding pixel lines L, as indicated by the broken lines shown in Fig. 4.
  • the luminous flux emitted from the center point A of the aperture 6-1 shown in the centre of Fig. 4 is incident upon the corresponding cylindrical lens 2-1 of the second lenticular lens 2 and focused on the centre of the pixel line 1-1 in the LCD 1 as indicated by the broken line shown on the point A'.
  • Luminous flux which is emitted from the centre point A of the aperture 6-1 and incident upon cylindrical lenses other than the cylindrical lens 2-1 which construct the lenticular lens 2 is focused on each centre of other pixel lines representing the first parallax image L on the LCD 1.
  • Luminous flux emitted from points D and E which are the edges of the aperture 6-1 and incident upon the corresponding cylindrical lens 2-1 of the second lenticular lens is focused respectively on points D' (broken line) and E' (two-dot chain line) at the end of the pixel line 1-1.
  • luminous flux which is emitted from other points of the aperture 6-1 and incident upon cylindrical lens 2-1 is focused on the pixel line 1-1 on the LCD 1 as a focal line. All luminous flux emitted from the aperture 6-1 and incident upon cylindrical lenses other than the cylindrical lens 2-1 is focused on the pixel lines displaying the first parallax image L on the LCD 1.
  • Luminous flux emitted through the apertures having a checker pattern besides the aperture 6-1 is all similarly focused on the pixel lines displaying the first parallax image L on the LCD 1, and illuminates lines of the first parallax image L on the LCD 1. Then, the luminous flux transmitted through the LCD 1 is diverged only in the vertical direction in correspondence with the NA (numerical aperture) of each luminous flux at the time of focusing, enabling to obtain an observation area in which the first parallax image is viewed as equally separated images from the top to bottom of the display, from a predetermined height of a viewer's eye.
  • the tolerance of assembling error is increased by the distance between points D' and B' on the pixel line 1-1 (in a case where the black matrix or the like of the liquid crystal is disregarded).
  • the aperture ratio of a pixel of the LCD is not 100% due to the black matrix which shields light, but is set so as to prevent light from being incident on the adjacent (vertical) pixel aperture.
  • ⁇ is a ratio (vertical pixel aperture ratio) of a vertical pixel aperture width to the vertical pitch Vd of an LCD pixel.
  • Figs. 5A to 5C are explanatory views for explaining the tolerance of deviation in the rotational direction supposing the centre of the stereoscopic image display apparatus as the centre of rotation.
  • Fig. 5A shows an illumination pattern of light which is emitted through the apertures 6a (the aperture through which luminous flux for left eye transmits) of the mask pattern 7, transmitted through the lenticular lenses 3 and 2, and reaches the liquid crystal layer (image display surface) on the LCD 1.
  • Fig. 5B is an explanatory view schematically showing the pixel lines R and L (parallax images R and L) on the LCD 1.
  • Fig. 5C is an explanatory view showing a deviation in the rotational direction, generated between the illumination pattern shown in Fig. 5A and pixel lines R and L in Fig. 5B.
  • the pixel lines R and L in which horizontal-long left and right parallax images are alternately arrayed in the vertical direction as shown in Fig. 5B, are arranged while including light shielding portions, i.e. black matrices, in between the horizontal pixels.
  • black matrices in between the horizontal pixels are omitted herein since they are not necessary for the description.
  • a part of the illuminated light shown in Fig. 5A is directed to the left eye of the viewer through the pixel lines R on the image display surface of the LCD 1, causing crosstalk.
  • the condition of positioning for not generating the crosstalk is in that the rotation angle satisfies the following expression (6): arcsin [Vd ⁇ ((2- ⁇ )-Vt/(Vm/2) ⁇ /W] (where W is a width of a display in the horizontal direction).
  • the tolerance is increased as compared to the conventional stereoscopic image display apparatus.
  • Fig. 6 is a perspective view showing the main portion of the second embodiment according to the present invention.
  • the second embodiment differs from the first embodiment by utilizing a CRT 8 which is a self-illuminating device in place of the mask substrate 4 and back light 5, to form a pattern consisting of emission portions and non-emission portions.
  • the second embodiment also utilizes luminous flux from the emission portion as similar to the first embodiment, attaining the same effect.
  • the configuration of the second embodiment since required precise alignment in positioning is less strict as compared to the conventional stereoscopic display apparatus, it is possible to achieve cost reduction in adjustment during assembly. It is possible to achieve a stereoscopic image display apparatus which enables the viewing of a high quality stereoscopic image from a wide area without seeing a double image, while giving flexibility to precise adjustment during the assembly of the main portion of components which construct the entire apparatus.
  • Fig. 7 is a perspective view showing the main portion of the third embodiment according to the present invention.
  • the third embodiment differs from the first embodiment in the vertical- and horizontal-width relation between the apertures and the light shielding portions of the mask pattern.
  • the horizontal widths Ht and Hs of the aperture and light shielding portion are set so as to satisfy Ht ⁇ Hs
  • Other constructions are the same as that of the first embodiment.
  • Fig. 8 is a front view of the mask pattern 7 according to the third embodiment.
  • the light intensity from the respective pixel lines R and L form rectangular waves on the viewing surface. If the rise of the rectangular wave is slightly slow, light from the pixel lines R and L intersect. And if a viewer's eye is near the intersection portion, the viewer might recognize the image as a double image where the left and right images are mixed.
  • each aperture of the mask pattern 7 is narrowed so that a distributed width of the light amount on the observation surface of the light transmitted through the respective apertures is narrowed.
  • Fig. 9 shows the distribution of light on the observation surface of the light from the pixel lines R and L according to the stereoscopic image display apparatus of the present embodiment.
  • the abscissa corresponds to a position on the viewing surface in the horizontal direction, and the ordinate indicates the amount of light thereon.
  • the aperture width Ht of the aperture 6 by limiting the aperture width Ht of the aperture 6, the light distribution of each of the pixel lines R and L intersects at the point near the light amount 0.
  • the mask pattern in the present embodiment may be configured with a reduced aperture ratio in both the horizontal and vertical directions in the mask pattern 7 as shown in Fig. 10, i.e. configured such to satisfy Ht ⁇ Hs and Vt ⁇ Vs, so as to attain the advantage of the first and third embodiments.
  • the mask substrate 4 and back light 5 may be substituted with the CRT 8 serving as the self-illuminating device.
  • Ht ⁇ Hs is satisfied, assuming that the horizontal widths of the emission portions and non-emission portions are Ht and Hs respectively.
  • the vertical widths of the emission portions Vt and non-emission portions Vs may be set to Vt ⁇ Vs.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Claims (11)

  1. Stereoskopiebildanzeigegerät mit:
    einer Anzeigevorrichtung (1) zum Anzeigen eines ersten und eines zweiten Parallaxenbildes für jeweils das rechte und das linke Auge (ER, EL) eines Betrachters, wenn diese beleuchtet werden;
    einer optischen Einrichtung (2, 3) mit einer Aufreihung an optischen Elementen, die jeweils eine Linsenfunktion zumindest in der vertikalen Richtung haben; und
    einer Lichtbereitstellungseinrichtung (4, 7, 5, 8) zum Bereitstellen eines gemusterten Lichtflusses, wobei die Lichtbereitstellungseinrichtung eine Vielzahl an Beleuchtungsbereichen zum Beleuchten der Anzeigevorrichtung über die optische Einrichtung und eine Vielzahl an Nichtbeleuchtungseinrichtungen, die die Anzeigevorrichtung nicht beleuchten, aufweist, wobei die Vielzahl an Beleuchtungsbereichen und die Vielzahl an Nichtbeleuchtungsbereichen sowohl in der horizontalen als auch in der vertikalen Richtung angeordnet sind, wobei die Lichtbereitstellungseinrichtung, die optische Einrichtung und die Anzeigevorrichtung so eingerichtet sind, dass der Lichtfluss, der das Parallaxenbild für das rechte Auge definiert, zu dem rechten Auge gerichtet ist, und der Lichtfluss, der das Parallaxenbild für das linke Auge definiert, zu dem linken Auge gerichtet ist, wodurch das Betrachten eines stereoskopischen Bildes ermöglicht wird;
    dadurch gekennzeichnet, dass
       die vertikalen Breiten der Beleuchtungsbereiche und der Nichtbeleuchtungsbereiche Vt bzw. Vs die folgende Ungleichung erfüllen: Vt < Vs.
  2. Gerät gemäß Anspruch 1, wobei
       die Lichtbereitstellungseinrichtung die Vielzahl an Beleuchtungsbereichen und die Vielzahl an Nichtbeleuchtungsbereichen mittels eines Maskensubstrates (4) ausbildet, das mit einem Maskenmuster (7) versehen ist, das eine Vielzahl an Lichtübertragungsabschnitten (6a, 6b) zum Übertragen von Beleuchtungslicht und eine Vielzahl an Lichtabschirmabschnitten (6c) zum Blockieren des Beleuchtungslichtes hat, die jeweils bei einem vorbestimmten Abstand in der horizontalen Richtung und bei einem vorbestimmten Abstand in der vertikalen Richtung angeordnet sind, und wobei Vt und Vs vertikale Breiten der Lichtübertragungsabschnitte (6a, 6b) bzw. der Lichtabschirmabschnitte (6c) sind.
  3. Gerät gemäß Anspruch 1, wobei
       die Lichtbereitstellungseinrichtung die Vielzahl an Beleuchtungsbereichen und die Vielzahl an Nichtbeleuchtungsbereichen mittels einer Lichtquellenvorrichtung (5, 8) ausbildet, bei der eine Vielzahl an Lichtausgabeabschnitten (6a, 6b) und eine Vielzahl an Lichtnichtausgabeabschnitten (6c) bei einem vorbestimmten Abstand in der horizontalen Richtung und bei einem vorbestimmten Abstand in der vertikalen Richtung angeordnet sind, und wobei Vt und Vs die vertikalen Breiten der Lichtausgabeabschnitt (6a, 6b) bzw. der Lichtnichtausgabeabschnitt (6c) sind.
  4. Gerät gemäß Anspruch 1, wobei
       die horizontalen Breiten der Beleuchtungsbereiche (6) und der Nichtbeleuchtungsbereiche (7) Ht bzw. Hs die folgende Ungleichung erfüllen: Ht < Hs.
  5. Gerät gemäß Anspruch 1, wobei
       die optische Einrichtung (2, 3) eine erste lentikuläre Linse (3), die eine Vielzahl an optischen zylindrischen Linsenelementen mit einer Brechkraft in der horizontalen Richtung hat, die horizontal bei einem vorbestimmten Abstand aufgereiht sind, und eine zweite lentikuläre Linse (2) aufweist, die eine Vielzahl an optischen zylindrischen Linsenelementen mit einer Brechkraft in der vertikalen Richtung hat, die vertikal bei einem vorbestimmten Abstand aufgereiht sind.
  6. Gerät gemäß Anspruch 1, das für eine Verwendung derart angepasst ist, dass das durch die Anzeigevorrichtung (1) angezeigte Bild aus einem Horizontalstreifenkombinationsbild bestehen soll, bei dem zwei Parallaxenbilder jeweils in eine Vielzahl an Horizontalstreifenparallaxenbilder geteilt sind, und die geteilten Horizontalstreifenparallaxenbilder wiederholt bei einem vorbestimmten Abstand in der vertikalen Richtung in einer vorbestimmten Reihenfolgenübereinstimmung mit der Anzahl N an Parallaxenbildern aufgereiht werden sollen.
  7. Gerät gemäß Anspruch 1, wobei
       die optische Einrichtung (2, 3) so eingerichtet ist, dass sie jeden Abschnitt des gemusterten Lichtflusses in einen im Wesentlichen parallelen Lichtfluss im horizontalen Querschnitt und in einen Lichtfluss, der im Wesentlichen an der Anzeigevorrichtung (1) im vertikalen Querschnitt konvergiert, umwandelt.
  8. Stereoskopiebildanzeigegerät mit:
    einer Anzeigevorrichtung (1) zum Anzeigen eines ersten oder eines zweiten Parallaxenbildes für jeweils das rechte und das linke Auge (ER, EL) eines Betrachters, wenn diese beleuchtet werden;
    einer optischen Einrichtung (2, 3) mit einer Aufreihung an optischen Elementen, die jeweils eine Linsenfunktion zumindest in der horizontalen Richtung haben; und
    einer Lichtbereitstellungseinrichtung (4, 7, 5, 8) zum Bereitstellen eines gemusterten Lichtflusses, wobei die Lichtbereitstellungseinrichtung aus einer Vielzahl an Beleuchtungsbereichen zum Beleuchten der Anzeigevorrichtung über die optische Einrichtung und aus einer Vielzahl an Nichtbeleuchtungsbereichen, die die Anzeigevorrichtung nicht beleuchten, aufweist, wobei die Vielzahl an Beleuchtungsbereichen und die Vielzahl an Nichtbeleuchtungsbereichen sowohl in der horizontalen als auch in der vertikalen Richtung angeordnet sind, wobei die Lichtbereitstellungseinrichtung, die optische Einrichtung und die Anzeigevorrichtung so eingerichtet sind, dass ein Lichtfluss, der das Parallaxenbild für das rechte Auge definiert, zu dem rechten Auge gerichtet ist, und ein Lichtfluss, der das Parallaxenbild für das linke Auge definiert, zu dem linken Auge gerichtet ist, wobei das Betrachten eines stereoskopischen Bildes ermöglicht wird;
    dadurch gekennzeichnet, dass
       die horizontalen Breiten der Beleuchtungsbereiche und der Nichtbeleuchtungsbereiche Ht bzw. Hs die folgende Ungleichung erfüllen: Ht < Hs.
  9. Gerät gemäß Anspruch 8, wobei
       die Lichtbereitstellungseinrichtung die Vielzahl an Beleuchtungsbereichen und die Vielzahl an Nichtbeleuchtungsbereichen mittels eines Maskensubstrates (4) ausbildet, das mit einem Maskenmuster (7) versehen ist, das eine Vielzahl an Lichtübertragungsabschnitten (6a, 6b) zum Übertragen von Beleuchtungslicht und eine Vielzahl an Lichtabschirmabschnitten (6c) zum Blockieren des Beleuchtungslichtes hat, die jeweils bei einem vorbestimmten Abstand in der horizontalen Richtung und bei einem vorbestimmten Abstand in der vertikalen Richtung angeordnet sind, und wobei Ht und Hs die horizontalen Breiten der Lichtübertragungsabschnitte (6a, 6b) bzw. der Lichtabschirmabschnitte (6c) sind.
  10. Gerät gemäß Anspruch 8, wobei
       die Lichtbereitstellungseinrichtung die Vielzahl an Beleuchtungsbereichen und die Vielzahl an Nichtbeleuchtungsbereichen mittels einer Lichtquellenvorrichtung (5, 8) ausbildet, bei der eine Vielzahl an Lichtausgabeabschnitten (6a, 6b) und eine Vielzahl an Lichtnichtausgabeabschnitten (6c) bei einem vorbestimmten Abstand in der horizontalen Richtung und bei einem vorbestimmten Abstand in der vertikalen Richtung angeordnet sind, und wobei Ht und Hs die horizontalen Breiten der Lichtausgabeabschnitte (6a, 6b) bzw. der Lichtnichtausgabeabschnitte (6c) sind.
  11. Gerät gemäß Anspruch 8, wobei
       die optische Einrichtung (2, 3) eine erste lentikuläre Linse (3), die eine Vielzahl an zylindrischen optischen Linsenelementen mit einer Brechkraft in der horizontalen Richtung hat, die horizontal bei einem vorbestimmten Abstand aufgereiht sind, und eine zweite lentikuläre Linse (2) aufweist, die eine Vielzahl an zylindrischen optischen Linsenelementen mit einer Brechkraft in der vertikalen Richtung hat, die vertikal bei einem vorbestimmten Abstand aufgereiht sind.
EP98301160A 1997-02-18 1998-02-17 Stereoskopische Bilddarstellugnsvorrichtung mit spezifischem Maskenmuster Expired - Lifetime EP0859525B1 (de)

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EP0859525A3 (de) 1999-03-24
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JPH10232369A (ja) 1998-09-02

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